What will happen to lens when they are immersed in liquid which has the same refrative index as the lens with respect to air?

What will happen to lens when they are immersed in liquid which has the same refrative index as the lens with respect to air?

1).

Concave lens will act like a convex lens

2).

Lens will act like a plane mirrror

3).

Convex lens will act like a concave lens

4).

There will be no change

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